ContinuousIntegration/TDD-Mocking/src/test/java/de/edu/hsfulda/ciip/tdd/StatusDeadTest.java

package de.edu.hsfulda.ciip.tdd;

import static org.hamcrest.CoreMatchers.equalTo;
import static org.junit.Assert.assertThat;
import static org.mockito.Mockito.mock;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameter;
import org.junit.runners.Parameterized.Parameters;

@RunWith(Parameterized.class)
public class StatusDeadTest {
	private static State[] states = { mock(State.class, "alife"), new StateDead() };
	private static final int alife = 0;
	private static final int dead = 1;

	@Parameters(name = "{index}: condition: {0} expected: {2}")
	public static Collection<Object[]> data() {

		return Arrays
				.asList(new Object[][] { { "all dead", 0, dead }, { "one alife", 1, dead }, { "two alife", 2, dead },
						{ "four alife", 4, dead }, { "five alife", 5, dead }, { "three alife", 3, alife } });
	}

	@Parameter // first data value (0) is default
	public /* NOT private */ String assertMessage;

	@Parameter(1)
	public /* NOT private */ int aliveneigborCount;

	@Parameter(2)
	public /* NOT private */ int expected;

	@Test
	public void calculateNextState() {
		// arrange
		List<State> neigborStates = new ArrayList<>();
		for (int i = 0; i < aliveneigborCount; i++)
			neigborStates.add(states[alife]);
		while (neigborStates.size() < 8) {
			neigborStates.add(states[dead]);
		}
		Collections.shuffle(neigborStates);

		// act
		State stateDead = states[dead];
		State result = stateDead.nextBy(neigborStates);

		// assert
		assertThat(assertMessage, result, equalTo(states[expected]));
	}

}